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  1. J

    loss of rpms and top speeed

    1987 omc 7.5 460. boat used to go 60mph on a flat river. now i can only get about 40 mph and 3500 rpms. also random backfires out of the carb.(thru hull exhaust makes it hard to hear and identifly where noise comes from) i have changed the fuel seperator, rebuilt the carb twice, new plugs, cap...
  2. J

    impossible to find gasket ruining my boating season!!!!

    i had a lifter pop out of place so i had to take the intake manifold off. turns out it is impossible to find the gasket for the intake manifold. i have ordered several only to find it doesnt fit. i have a 87 omc ford 460 with all stock parts. every gasket i get doesn fit. i dont knwo what to do...
  3. J

    waterpump question.

    for my dads boat. 1992 thomson 4.3 v6. hasent been run in maybe 4 years. just installed a new engine. hooked the earmuffs up and i think the impeller is shot. water still shoots out by the earmuffs as if the pump is not sucking the water up. also the water comes dribbling out of the hole where...
  4. J

    hooked up battery terminals wrong!!

    my brother hooked up the battery backwords and now all kinds of trouble. first i had no power at all in the boat. ran a temporary wire from the battery to the ignition so i could run the boat. I had to replace the fuse to operate the trim. however no alternator. all of a sudden everything worked...
  5. J

    bottom paint

    just hired some mexican to paint the bottom of my boat. it was never painted. he sanded it down good but the guy put one coat of paint on. is this gonna work from now till the end of the season. its already on the trailer it would be a real pain in the ass to take it off again to apply a second...
  6. J

    Backfire....

    27foot omc 460. crusing along and every 30 seconds or so i get a backfire. if im sitting at 3600 rps at about 32mph ill get a bang every once in a while. the more i pull the throttle back the better it gets and usually if i leave it at 3200 rpms its good but as soon as i get it up to 35 and over...
  7. J

    15.5x14?????

    i have a 27 foot boat with a omc 460. right now i have a 14.5x19 prop and i get about 40mph at 4200rpms. the guy who sold me the boat gave me an extra prop that says 15.5x14. what would that do on my boat. I would like a couple more mph and crusing speed. also save some gas money. i have no prop...
  8. J

    holes in bellows/taking on water??

    My boat takes on about 2inches of water every 24 hours or so. my pump can handle it no problem. interestingly enough when i took the boat out of the water to repaint the bottom i raised the drive and the bellow/boot has about 10 big holes in it. seems like a no brainer that the water has to be...
  9. J

    interesting barnacle problem

    being new to boating, i didnt bottom paint my boat. after two weeks of sitting in the water every inch of my boat (bottom) was coverd with barnacles. My boat would only go about 10 mph and it wouldnt even plane out. i took it to a beach and scraped every last barnacle off. it worked like a...
  10. J

    fuel pump strategy.

    took my boat out the other day and all of a sudden as soon as its gets on a plane is looses power and slows down to a crawl. figured it had to be the carb so i rebuilt it. wasnt it. no place to get a fuel pump this late to fit the boat. found a universal pump 7psi max and ran it along side of my...
  11. J

    omc shift interrupter switch

    ok. After reading a bunch of posts i was convinced my lower shift cable was bad. when i shift into gear my interuppter switch makes the boat stall. i was told it was my lower shift cable however the cable shifts with ease. i have no trouble shifting with my hand if i disconnect the cable. my...
  12. J

    does this sound right

    put 50 gallons in my 27 foot boat with a 460 omc. cruised at about 3200 rpms 30mph. went about 75miles till i ran out of gas. about 1 1/2 miles a gallon crusing. dont know if thats normal but damn expensive. anyway the next day i put 35 gallons in and went about 25 miles however didnt even plane...
  13. J

    adding silent choice

    this is not really a problem but actualy a question. I have an omc 460 with thru hull exhaust. I am sick of my girlfirend complaining of the noice. I would like to have the optioin of silent choce. I have a Y shaped pipe that i was told i can install and the exhaust would exit out the drive...
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